Improvement in scroll-sawing machines



4 Sheets-Sheet 1. N. P. SELDEN. Scroll Sawing-Machine. No. 212,326.

Patented Feb. 18, I879.

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-PETERS, PHOTO LITHOGRAPHER WASHINGTON D 04 4 Sheets sheet 2.

N. P. SELDEN.

Scroll Sawing-Machine. No. 212,326. Patented Feb. 18,1879.

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4 N E D L E S DIM N Scroll Sawing-Machine.

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N. P. SELDEN.

Scroll Sawing-Machine.- No. 212,326. Patented Feb. 18,1879.

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of its circular saw table.

UNITED STATES PATENT EELS PETER SELDEN, OF BELLE PLAINE, IOWA.

'FFIGE;

IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 212,326, dated February 18, 1879; application filed March 7, 1878.

To all whom it may concern:

Be it known that I, New PETER SELDEN, of Belle Plaine, in the county of Benton and State of Iowa, have invented certain new and useful Improvements in Sawing-Machines; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawin gs, and to letters of reference marked thereon, which form a part of this specification, and in whieh Figure 1 is an elevation of my combined foot-power sawing-tool. Fig. 2 is a top view Fig. 3 is an elevation of one of its hinges. Fig. 4 is a top view of the same. Fig. 5 is an end view of the fretsaw proper and its connection with the main shaft, omitting the other parts of the combination-tool. Fig. 6 is a front view of the fulcrum-frame of the fret-saw. Fig. 7 is a detail view of its tension device. Fig. 8 is a detail View of the jig-saw of my combinationtool. Fig. 9 is a horizontal sectionthrough its operating crank-pin and slide. Fig. 10 is a side view of the said slide. Fig. 11 is a plan view of the treadle of my combination-tool. Fig. 12 is an end view of the treadle-motion proper of -my combination-tool, omitting the saws. Fig. 13 is a central longitudinal section through the operating-pulley of the treadle-motion. Fig. 14 is an enlarged detail view of the connection between the operating-pulley and the fiy-wheel of the main shaft.

The nature of my invention consists in a novel tension device for the jig-saw, and an improved construction of a removable table for the jig-sawfi,

In the drawings, A represents a lathe-body of ordinary construction. Upon its shears a a frame, B, of a circular saw, 0, is fastened by means of screw-bolts b, dog-plates I), and thumb-nuts b A table, B, rests upon the frame B, and is connected with it by means of hinges B B The upper hinge, B is screwed to the table B, and consists of a horizontal cylinder, 1), a narrow neck, I), and a transverse foot-plate, b wherewith it is fastened. The lower hinge, B is annular, and encircles the part I) of the upper hinge, B the neck b of which fits into a central slot, 1), of the lower hinge, the lower part of which slot is entirely open on one side, and forms a passage, 1), just large enough to allow the neck I) to be slipped in or out. If, therefore, the table B is turned over and then pushed sidewise, it becomes detached from the frame B, and by horizontally inserting the part b and neck the table B is reattached to the frame B.

In the frame B the saw-shaft G is properly hung, having a circular saw, 0, at one end, and a fly-wheel, O, at the other. The fly-wheel O is provided with an eccentric, G which has at its free side two guide-lugs, c 0 whereby the eccentric-strap d is kept in place, as shown in Figs. 1 and 5. An eccentric-rod, D, fits about one-third of the circumference of the eccentric, and is, at its foot, provided with a strap, (1, fastened thereto by a thumb-screw, d. The strap (1 fits about one-third around the eccentric, and can easily be detached from it by loosening the thumb-screw d and swinging the strap off while shaft 0 is in such position that the lugs c c are not in. the way. The rod D is pivoted at d to the lower lever, E, of a fret-saw. The short arm of the lever E is connected with the short arm of an upper lever, E, by means of a tension device consisting of two stirrups, e c, and a swivelscrew, 6 whereby the two stirrups may be screwed toward or from each other. The 1evers E E are provided with fdlcrum-shaftsc c, which are stepped at one side, and provided with pins 6 on the other side, and which are hung in a frame, F F. The part F of the frame is a rod, of suitable shape and length, so that its lower end may be fastened to the foot of the lathe A, as at a. To the upper part of the rod F the part F is fastened, so that they form an oblong sufficientlylarge for the admittance of the lovers E E, which can easily be removed therefrom by first removing the pins 6 and then slipping the shafts e 6 back until their stepped ends have left the rod F, whereupon they are entirely removed from the part F and the levers are disengaged. A flange, f, of the part F serves as means for fastening the fulcrum-frame to the saw-frame B.

The right end of the saw-shaft G is suffi ciently extended beyond the saw 0 to carry a crank-plate, Gr, with a crank-pin, g, and afric tion-roller, 9, upon it. The roller moves in .a horizontal slot, h, of a vertical slide, I-I, dovesame bar.

tailed into a vertical guide, H, which forms a part of the frame I of a jig-saw table, I. The center part, 1 of the frame I is fitted between the shears a of the lathe-body A, and extends below the same, where it is provided with a double pulley, J, just below the slide H. The frame I is fastened to the shears a by means of a dog-plate, t, and bolt t", with thumb-screw 13 and thus it may be fastened in position for operation with the jig-saw or out of the way when the circular saw is to be used.

The top part of the slide H is provided with a slotted metal head, b to which the lower end of the saw-blade is secured. To the lower part of the slide H a strap, j,is attached, which is fastened to the smaller pulley j of the double pulley J. To the larger pulley 7' of the said double pulley a tension-strap, K, is attached, which passes over a tension-pulley, K, suitably attached to one of the walls of the shop, and finally is fastened to the larger pulleyj of another double pulley, J. The pulley J is attached to a slide-head, L, suitably attached to a pendent beam, L, of the shop by means of slots land set-screws I, so as to be vertically adjustable.

An ordinary vertically-adjustable presserfoot, M, is fastened to the back of the pendant L, and is, near its foot, provided with a centrally-grooved guide-roller, m,for the guidance of the saw. e

To the small pulley j of the double pulley J a strap, f, is attached, which, at its lower end, is provided with a slotted head, 7%, to which the upper end of the saw-blade is secured. An expansible swivel-connection, 7c, of ordinary construction, or similar to that used in the fretsaw, serves to take up the slack of the strap K.

The described mode of hanging the jig-saw has the advantage that the saw does not yield below the table 1, and above, where it can be observed, it only yields with the presser-foot, thus doing its work more accurately than other jig-saws of lighter construction. By means of the strap K and double pulleys J J the tension of the jig-saw maybe very great, while that of the strap K is comparatively easy, and thus the wear and tear of the strap are greatly reduced.

The fret-saw is provided with a removable table, N, the legs at of which are provided with steadypins a. Two of the legs 'lt rest on the table B of the circular saw, their pins 02, being firmly lodged in the wood of the table. One leg it rests on an upright arm, 0, fastened to the end of the lathe-body A. The pin a is fitted into the ammo, and held there by a setscrew, 0. The fourth leg is substituted by a bracket, N, fastened to the lathe-body at n and to the table at n by screws or other suitable means.

The treadle of the foot-power consists of a foot-board, I hinged at p to a rigid bar, P and resting upon two levers, P P hinged to the The hinge p of the foot-board P is slightly yielding, so the foot-board may be swung alittle in or out upon theileversfor the purpose of adjustment. The levers P P have for this reason holes 1) at suitable distances, into which the fastening screws or bolts 19 oi. the foot-board are inserted.

A spring, Q, connects with the central part of the treadle and the lathe-body above, and

thereby keeps the treadle up. A number of I staples, q, are fastened to the lever P and to these the treadle-strap q is hooked, according to the convenience of the operator.

.A double pulley, R, with a shaft, 1', is hung between the end of the shaft (3 and the arm 0, and has the strap 1 attached to it. The strap q of a take-up spring, Q, is also attached to the'said pulley. vThe large endof the pulley R is provided with a face-plate, It, two pawls, r, and a double rear abutment, T for the pawls. The fly-wheel O is provided with a circular rim, 0, having inner ratchet-teeth, c. The formation of the abutment r is such that the square ends of the pawls 4 rest firmly upon them when the pawls are engaged with the ratchet-teeth 0 as seen in Fig. 14. By this construction the strain of the engaged pawl is sustained by its abutment, leaving the pivot of the pawl free from excessive wear.

The shaft 7' has its one bearing in the end of the shaft (3, which avoids the construction of an extra journal-bearing.

Operation: When the treadle is moved down the strap q revolves, and one of the pawls en; gages with one of the ratchet -teeth 0, and thereby revolves the fly-wheel O and shaft (J, with the circular saw 0, which is ready for use by having its table B in position. When the treadle is relieved the spring Q moves it up again, and the take-up spring Q reverses the motion of the pulley R until the strap q is taut. When the fret-saw is to be used the eccentric-rod Dis moved upon the eccentric .0 The rod d is turned upon the eccentric and fastened to the rod D by means of the thumbscrew (1 WVhen the jig-saw is to be used the table I is removed from its position at'the end .of the lathe-body by loosening the thumbscrew t and slippingthe frame I under the head h and there fastened. The sawis then secured to the heads h h".

Having thus described my invention, what I claim, and wish to secure by Letters Patent,

1. The combination of the pulleys J J, the tension-belt K, the saw-straps j j, and the slide H, substantially as set forth.

2. The combination of the lathe-bed A with the table I 1 having the vertic.l guide H, and the extension 1 to receive the double pulley J, substantially as and for the purpose set forth.

In testimony that 1 claim the foregoing as my own I hereunto affix my signature in the presence of two witnesses.

NELS PETER SELDEN. Witnesses:

D. H. Fnos'r, S. S. SWEET. 

